Boris Keil1, Christina Triantafyllou1,2,
Michael Hamm3,
1A.A. Martinos Center for Biomedical
Imaging, Department of Radiology, MGH, Harvard Medical School, Charlestown,
MA, United States; 2A.A. Martinos Imaging Center, Mc Govern
Institute for Brain Research, MIT, Cambridge, MA, United States; 3Siemens
Healthcare, Charlestown, MA, United States; 4Harvard-MIT Division
of Health Sciences and Technology, MIT, Cambridge, MA, United States
The
development of high-field coils with an increasing number of elements places
increasingly constraints on the arrangement of the components, including
preamplifier, cables and cable traps. For maximum spatial efficiency and
reduced losses, most of the components needed to be placed adjacent to the
corresponding coil loop. Reduced interaction with the transmit coil requires
a sparse configuration of conductors, well isolated through cable traps. In
this study a new generation of a 32-channel coil at 7T was constructed,
tested, and compared to a previous 32-channel design. Substantial changes
have been implemented to achieve better SNR, increased stability, lower
transmit power.